From the sound of it, a handling fee not exceeding 2.9% can be imposed.

Plus at the price post $78 is a a deal for a $99 plus ship speaker.

"No Surcharges. Under Visa and MasterCard regulations and the laws of several states, including California, merchants may not charge a fee to the buyer for accepting credit card payments (often called a "surcharge"). You agree that you will not impose a surcharge or any other fee for accepting PayPal as payment. This restriction does not prevent you from imposing a handling fee in connection with the sale of goods or services, as long as the handling fee does not operate as a surcharge (in other words, the handling fee for transactions paid through PayPal may not be higher than the handling fee for transactions paid through other payment methods)."